These specifications are temporary due to unimplemented high performance XGATE fuel injection code which could potentially fire all device pins with mediocre performance. Once that is developed this post will be edited to reflect the current state of the play, or a new thread will be created and this one will be here as a part of history.

Currently we have 6 timed channels officially designated as ignition channels, but usable for either ignition or injection duties.

This post will only cover 4 stroke and rotary engines

This limits us to the following configurations early on in the development cycle:

Note: An appropriate set of RPM/position sensors, matching decoder and associated sync level is required for all of these.

12 cylinder engines

Semi sequential injection ONLY

Wasted spark ignition ONLY

Distributor ignition AND Bank/batch injection

10 cylinder engines

Semi sequential injection AND Distributor ignition

Wasted spark ignition AND Batch injection

Distributor ignition AND Bank/batch injection

8 cylinder engines

Semi sequential injection AND Distributor ignition

Semi sequential injection AND Twin distributor ignition

Wasted spark ignition AND Bank/batch injection

Distributor ignition AND Bank/batch injection

6 cylinder engines

Sequential injection ONLY

COP/CNP ignition ONLY

Semi sequential injection AND Wasted spark ignition

Semi sequential injection AND Distributor ignition

Wasted spark ignition AND Bank/batch injection

Distributor ignition AND Bank/batch injection

5 cylinder engines

Sequential injection AND Distributor ignition

COP/CNP ignition AND Batch injection

Distributor ignition AND Batch injection

4 cylinder engines

Sequential injection AND Wasted spark ignition

Sequential injection AND Distributor ignition

COP/CNP ignition AND Semi sequential injection

COP/CNP ignition AND Bank/batch injection

Semi sequential injection AND Wasted spark ignition

Semi sequential injection AND Distributor ignition

Wasted spark ignition AND Bank/batch injection

Distributor ignition AND Bank/batch injection

3, 2, and 1 cylinder engines

Sequential injection AND COP/CNP ignition

Sequential injection AND Wasted spark ignition

Sequential injection AND Distributor ignition

COP/CNP ignition AND Semi sequential injection

COP/CNP ignition AND Bank/batch injection

Semi sequential injection AND Wasted spark ignition

Semi sequential injection AND Distributor ignition

Wasted spark ignition AND Bank/batch injection

Distributor ignition AND Bank/batch injection

Notes:1) Sequential and COP/CNP etc in a 1 cylinder context just means timed to the event inside the full engine cycle.2) Distributor does not apply to single cylinder engines.3) Wasted/semi sequential doesn't apply to 3 cylinder engines.

Rotary engines

Rotary engines have some specific requirements that other engines do not have or do not usually have.

In the ignition area they have both a leading and trailing spark plug. These should be fired a few degrees apart and are relatively unimportant except for emissions. Power level increases from running the trailing plugs as well as the leading plugs, rather than just the leading plugs, are in the order of 1 or 2 percent.

In the fueling department most have staged injection from the factory. Each rotor has two intake runners with a throttle butterfly in each. The throttles are operated in a progressive fashion, with one opening first, and then the other. Because of this the secondary injectors must only be engaged once there is sufficient airflow in the secondary runners.

Available Compromises

The effect of the above is that for full independent control of a rotary, you need 4 channels per rotor. Given that the majority of rotaries are the twin rotor 13b, and that we have only 6 for the time being, we need to make some compromises.

Run a single stage of big injectors that can satisfy the engines fuel demands, and remove/plug the other injector bungs - This is a good choice for naturally aspirated engines and a less good, but still valid choice for turbocharged engines. This allows all other functions to be run optimally on a 13b by saving 1 - 2 channels, and saves either 1 or 3 channels on the 20b allowing less compromise elsewhere.

Run both primary and staged injection in semi sequential mode - This is a good choice for turbocharged engines or naturally aspirated engines, either 13b or 20b.

Don't run trailing plugs at all - This isn't a bad solution for most setups, but can be a bad choice on very high power setups where tight control of the flame front is required.

Run leading plugs in wasted spark mode - this is only suitable for the 13b or rare quad rotor engines, it's not possible to do this on the 20b.

You may mix and match the above compromises in order to achieve sufficient control of your rotary engine. Recommended configurations are below:

The last item previously said run trailing plugs wasted, this was in error and is not possible.

2 rotor engines

Turbo charged and mild NA: Run wasted spark on the leading plugs (this is not possible on trailing plugs) and semi sequential injection on the secondary injectors. This leaves four outputs for sequential and cop on the trailing plugs and primary injectors.

Wild NA: Don't run trailing plugs, run primary and secondary injectors sequentially and run cop on the main plugs. Wild NA engines will benefit significantly from proper outboard injection at higher RPM. You my prefer the other option over this one, or some other custom combination. Another option would be to run both leading and trailing in wasted spark rather than dropping the trailing support.

3 rotor engines

Triple rotors are not properly supported at this time. The compromises involved are fairly large by rotary user standards, though would result in smooth running powerful engines none-the-less. Here are the options:

Ignition only control: cop on both leading and trailing plugs.

Fuel only control: sequential on both primary and secondary injectors

Both option 1: cop on leading, no trailing, sequential on primary, no secondary

Both option 2: cop on leading, no trailing, Multi-shot batch on primary and secondary, one wasted output.

Run two FreeEMS units, one for fuel, one for ignition.

Clearly there are some downsides to running a 20b on FreeEMS right now, however given how uncommon they are, it's not a big deal. If you have a 13b, you will be very satisfied with the results you get from one of the above combinations.

These specifications are temporary due to unimplemented high performance XGATE fuel injection code. Once that is developed this post will be edited to reflect the current state of the play, or a new thread will be created and this one will be here as a part of history.

Currently we have 6 timed channels officially designated as ignition channels, but usable for either ignition or injection duties.

Some have one set of injectors are before the throttle plates and the other after them. This means that the secondary injectors should only be engaged while the throttle is at least partly open, if not fully.

All injectors in rotaries are after the throttle plates however the secondary throttles open progressively, and since the intake runners behind them are sealed off from the primary intake runners the secondary injectors need to be staged.

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